Reticulum sarcoplasmic
The reticulum sarcoplasmic is the name given to the endoplasmic reticulum smoothes muscular cells striated skeletal. This compartment is an internal reserve of Ca2+ ions (one calls it for this reason also Calciosome) which flow in the Cytoplasme in answer on arrival of a depolarization of the plasmic membrane caused by the fixing of the Acétylcholine on nicotinic receiving of the muscular cell. This cytoplasmic calcium increase causes the muscular contraction by allowing the interaction between the Myosine and the microfilaments of Actine. Calcium is then repompé (thanks to a pump consuming of the Adénosine triphosphate) in the reticulum sarcoplasmic.
The reticulum sarcoplasmic deploys its network in a particular way between the cytoplasmic membrane and the sarcomère. So that a Potentiel of action is propagated along the reticulum sarcoplasmic, and that released calcium is directly in contact with the sarcomère to initiate the contraction (diagram of a sarcomère with the reticulum sarcoplasmic highlighted, more explanation on the system T, etc).
See too
-
endoplasmic Réticulum
- endoplasmic Réticulum smoothes
- Calciosome
- Myocyte
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